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\chapter{Introduction}
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\section{Motivation, Task description and objectives}
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In times of tremendous increasing information technology security threats and
occurring incidents securing information technology systems gets even more
important then it was until yet. To build secure systems also means to implement
secure authentication methods. In front of this background the concept of "`Zero
Knowledge Authentication"', also often referred to as "`Zero Knowledge Proof"'
is going to be explained. Furthermore it is going to be demonstrated by an
example.
